144
GENERAL
j ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS
III. HUMIDI--MIZER
R
SYSTEM START-UP
STEPS
j 1. USE SERVICE TEST MODE TO TURN ON MAXIMUM COOLING.
TURN ON COOL A1 TEST UNDER COOL TEST MENU.
j 2. ON 48/50 FC 07 AND 48/50GC UNITS: TURN ON CIR A LOADER TEST UNDER THE COOL TEST MENU.
OBSERVE AND RECORD
A. SUCTION PRESSURE PSIG PSIG
B. DISCHARGE PRESSURE PSIG PSIG
C. ENTERING AIR TEMPERATURE _F _F
D. LIQUID LINE TEMPERATURE
AT OUTLET OR REHEAT COIL _F _F
E. CONFIRM CORRECT ROTATION FOR COMPRESSOR
F. CHECK FOR CORRECT RAMP--UP OF OUTDOOR FAN MOTOR AS CONDENSER COIL WARMS
j 3. CHECK UNIT CHARGE PER CHARGING CHART
j 4. SWITCH UNIT T O HIGH--LATENT MODE (SUBCOOL) BY TURNING HUMIDI M I ZER TEST TO SUBCOOL UNDER THE
COOL TEST MENU
OBSERVE
j A. REDUCTION IN SUCTION PRESSURE (5 TO 7 PSI EXPECTED)
j B. DISCHARGE PRESSURE UNCHANGED
j C. LIQUID TEMPERATURE DROPS TO 50 TO 55_F RANGE
j D. CLV SOLENOID ENERGIZED (VALVE CLOSES for no flow)
j 5. SWITCH UNIT TO DEHUMID (REHEAT) BY TURNING HUMIDIMIZER TEST TO REHEAT UNDER THE
COOL TEST MENU
OBSERVE
j A. SUCTION PRESSURE INCREASES TO NORMAL COOLING LEVEL
j B. DISCHARGE PRESSURE DECREASES (35 TO 50 PSI)
j C. LIQUID TEMPERATURE RETURNS TO NORMAL COOLING LEVEL
j D. CLV SOLENOID ENERGIZED (VALVE CLOSES FOR NO FLOW)
j E. RDV SOLENOID ENERGIZED, VALVE OPENS FOR FLOW
j 8. SWITCH UNIT TO OFF BY TURNING HUMIDIMIZER TEST TO OFF UNDER COOL TEST MENU
COMPRESSOR AND OUTDOOR FAN STOP; CLV AND RDV SOLENOIDS DE--ENERGIZED
ECarrier Corporation 2019 Edition Date: 2/19
P
rinted in U.S.A.
Catalog No: 04--- 53480227--- 01
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Form No: 48/50FC---GC---01T
Replaces: New
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